package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号是否合法
       if (RegexUtils.isPhoneInvalid(phone)){
           //2 不符合，返回错误信息
           return Result.fail("手机号格式不正确");
       }
        //3 符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4 保存验证码到redis中，key为phone，value为code，有效期2分钟  set key value ex 120 s
       stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5 发送短信验证码
        log.debug("发送短信验证码成功：{}",code);
        //6 返回ok
        return Result.ok();
    }
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式不正确");
        }
        //2 校验验证码 从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode(); //code前端传来的验证码
        if(cacheCode==null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4 一致，根据手机号查询用户  select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //4.1 判断用户是否存在
        if (user == null) {
            //4.2 不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        //5 保存用户信息到redis中
        //5.1 随机生成token
        String token = UUID.randomUUID().toString(true);

        //5.2 将User对象转换为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)  //将所有字段转换为字符串 string类型
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));

        //5.3 存储
        String tokenKey = LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token的有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //保存用户到数据库
        save(user);
        return user;
    }
}
